Variable focus electron gun assembly with ceramic spacers

Details Variable focus electron gun assembly with ceramic spacers Variable focus electron gun assembly with ceramic spacers

1994-05-13

1996-07-09

Zimmerman, Brian

Electric lamp and discharge devices

Cathode ray tube

Ray generating or control

313417, 313270, H01J 2946

Patent

active

055347479

ABSTRACT:
An electron gun having a stacked construction is provided, comprising a cylindrical shell, a cathode concentrically disposed within the shell, and at least one spacing ring disposed within the shell in abutting engagement with the cathode. The cathode is electrically insulated from the shell by the spacing ring, which is comprised of an electrically insulative material. The cathode and spacing ring are held together within the shell by simple mechanical force, such that the cathode and spacing ring can be readily detached from the shell as desired. An additional electrode, such as an anode or grid, may also be concentrically disposed within the shell, with a second spacing ring disposed in abutting engagement with the cathode and the electrode. A third spacing ring may also be disposed between the electrode and a shoulder portion of the shell disposed at an end thereof. Relative position of the cathode with respect to the electrode is determined by selection of the width of the spacing rings, enabling a variety of focusing characteristics for the electron gun.

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